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  • iOS移动应用开发零碎细节随笔

    1.关于视图交互的屏蔽问题

    (1)下文代码段表现的视图层次关系是self.view上放置_launchScrollView,而_launchScrollView 上放置了4个launchImageView用来当欢迎界面做应用首次使用介绍,再者最后1个launchImageView中间放置comeinBtn。 

    (2)现欲comeinBtnClick事件触发,且在默认情况下发现并不可行(userInteractionEnabled 默认为NO

    (3)分析:交互默认为NO,会屏蔽掉launchImageView内子视图所有点击事件和手势,所以必须要打开

     1 - (void)viewDidLoad
     2 {
     3     [super viewDidLoad];
     4     // Do any additional setup after loading the view.
     5     
     6     NSInteger imageCount = 4;
     7     _launchScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0.0, 0.0, HBScreenWidth, HBScreenHeight)];
     8     _launchScrollView.bounces = NO;
     9     _launchScrollView.pagingEnabled = YES;
    10     _launchScrollView.showsHorizontalScrollIndicator = NO;
    11     _launchScrollView.contentOffset = CGPointMake(0.0, 0.0);
    12     _launchScrollView.contentSize = CGSizeMake(HBScreenWidth * imageCount, 0);
    13     
    14     //导入图片
    15     for (NSInteger i = 0; i < imageCount; i++) {
    16         UIImageView *launchImageView = [[UIImageView alloc]initWithFrame:CGRectMake(HBScreenWidth * i, 0.0, HBScreenWidth, HBScreenHeight)];
    17         UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"start_h%d", i + 1]];
    18         image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0) resizingMode:UIImageResizingModeStretch];
    19         launchImageView.image = image;
    20         
    21         //此处交互默认为NO,会屏蔽掉launchImageView内子视图所有点击事件和手势,所以必须要打开
    22         launchImageView.userInteractionEnabled = YES;
    23         
    24         if (i == 3) {
    25             UIButton *comeinBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    26             comeinBtn.frame = CGRectMake(HBScreenWidth * 0.42, HBScreenHeight * 0.6 , HBScreenWidth * 0.17, HBScreenHeight * 0.08);
    27             comeinBtn.backgroundColor = [UIColor colorWithRed:197/255.0 green:233/255.0 blue:250/255.0 alpha:1.0];
    28             comeinBtn.layer.borderWidth = 1.0;
    29             comeinBtn.titleLabel.font = [UIFont fontWithName:nil size:15.0];
    30             [comeinBtn setTitle:@"点击进入" forState:UIControlStateNormal];
    31             [comeinBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    32             [comeinBtn addTarget:self action:@selector(comeinBtnClick) forControlEvents:UIControlEventTouchUpInside];
    33             [launchImageView addSubview:comeinBtn];
    34         }
    35         [_launchScrollView addSubview:launchImageView];
    36     }
    37     [self.view addSubview:_launchScrollView];
    38 }

    2.关于边框颜色和边框线条尺寸设定layer.borderColor 、borderWidth
    重点在
    borderColor
    1 UITextField *searchField = [[UITextField alloc]initWithFrame:CGRectMake(0.0, 0.0, searchView.frame.size.width *2/3, searchView.frame.size.height)];
    2     searchField.layer.borderColor = [bedBtnColor CGColor];
    3     searchField.layer.borderWidth = 1.0;
    3.UITableViewCell 分割线 选定Cell后背景自定义...
     1     //(1)cell创建后不管那种模式分割线总是不能填满tableView?[iPhone 和 iPad上可能会有所不同...(未解决)]
     2     //可以在UITableViewCell设置界面选择Separator Insets选择Custom,然后left,right自己定义就可,如果代码[myTableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
     3     cell.separatorInset = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0);
     4     
     5     //(2)分割线颜色
     6     _companyTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
     7     _companyTableView.separatorColor = [UIColor clearColor];
     8     
    9   //(3)以下两句改变cell被选中后可自定义背景颜色 10 cell.selectedBackgroundView = [[UIView alloc]initWithFrame:cell.frame]; 11 cell.selectedBackgroundView.backgroundColor = [UIColor grayColor];//livingBtnColor;
     3.字符串中关于编码的两种方式

    + (id)stringWithContentsOfFile:(NSString *)path usedEncoding:(NSStringEncoding *)enc error:(NSError **)error;

    是自动判断encode,如果打开成功,把encode放在enc 里,返回给调用者。

    声明一个NSStringEncoding 类型(其实就是NSUInteger)然后送指针给方法就是了。例如

    1
    2
    NSStringEncoding enc;
    NSString *string = [NSString stringWithContentsOfFile:path usedEncoding:&enc error:nil];

     成功之后你可以检查 enc 以确定 string 的编码。

     

    而另外一个:

    + (id)stringWithContentsOfFile:(NSString *)path encoding:(NSStringEncoding)enc error:(NSError **)error;

    则是你自己知道编码,明确要求用这种编码来读取文件内容。

    
    
    
    

    4.

    实现以下三个方法,如果弹出的键盘会遮住输入框 ,整体的界面会向上移动,这样就不会遮住输入框了。自己增加UITextFieldDelegate委托。
    只适合iPhone,如果想要支持iPad,只要把216改成iPad上面键盘的高度即可。

    - (void)keyboardWillShow:(NSNotification *)noti
    {        
            //键盘输入的界面调整        
            //键盘的高度
            float height = 216.0;                
            CGRect frame = self.view.frame;        
            frame.size = CGSizeMake(frame.size.width, frame.size.height - height);        
            [UIView beginAnimations:@"Curl"context:nil];//动画开始          
            [UIView setAnimationDuration:0.30];           
            [UIView setAnimationDelegate:self];          
            [self.view setFrame:frame];         
            [UIView commitAnimations];         
    }


    - (BOOL)textFieldShouldReturn:(UITextField *)textField 
    {        
        // When the user presses return, take focus away from the text field so that the keyboard is dismissed.        
        NSTimeInterval animationDuration = 0.30f;        
        [UIView beginAnimations:@"ResizeForKeyboard" context:nil];        
        [UIView setAnimationDuration:animationDuration];        
        CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);        
        self.view.frame = rect;        
        [UIView commitAnimations];        
        [textField resignFirstResponder];
        return YES;        
    }

    - (void)textFieldDidBeginEditing:(UITextField *)textField
    {        
            CGRect frame = textField.frame;
            int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//键盘高度216
            NSTimeInterval animationDuration = 0.30f;                
            [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];                
            [UIView setAnimationDuration:animationDuration];
            float width = self.view.frame.size.width;                
            float height = self.view.frame.size.height;        
            if(offset > 0)
            {
                    CGRect rect = CGRectMake(0.0f, -offset,width,height);                
                    self.view.frame = rect;        
            }        
            [UIView commitAnimations];                
    }

     5. AlertView自动隐藏,(代码模拟点击)

    [AlertObject dismissWithClickedButtonIndex:0 animated:NO]

    http://blog.csdn.net/likendsl/article/details/7514506

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  • 原文地址:https://www.cnblogs.com/HHB17/p/4177469.html
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